# Structure Analysis

## Matrix Stiffness Method

As one of the methods of structural analysis, the direct stiffness method, also known as the matrix stiffness method, is particularly suited for computer-automated analysis of complex structures including the statically indeterminate type. It is a matrix method that makes use of the members' stiffness relations for computing member forces and displacements in structures. The direct stiffness method is the most common implementation of the finite element method (FEM). In applying the method, the system must be modeled as a set of simpler, idealized elements interconnected at the nodes. The material stiffness properties of these elements are then, through matrix mathematics, compiled into a single matrix equation which governs the behaviour of the entire idealized structure. The structureâ€™s unknown displacements and forces can then be determined by solving this equation. The direct stiffness method forms the basis for most commercial and free source finite element software.

## jfMatrix Online Structural Analysis

jfMatrix is an online structural analysis web application. Using just a compatible browser (IE 10+, Chrome, Firefox, or any browser supporting HTML5), and without installing any software, you can now analyse frame structures from your computer, iOS, Android, and Windows Phone devices.

jfMatrix uses Matrix Stiffness Method to calculate reactions, deflections, and member forces. Moment, shear, reaction, axial and deflection diagrams can be visualized after analysis. Animated deflection diagram can also be viewed.